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KSSU Reactor.png
Kirby attempting to destroy the Reactor with its own gun in Kirby Super Star Ultra
First game Kirby Super Star (1996)
Latest game Kirby Super Star Ultra (2008)
Weakness(es) Its own laser attacks, Mach Tornado
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The Reactor (originally called Halberds Reactor) is the core power source of the Halberd. Without it operational, the ship will not be able to power its engines, so it is equipped with its own automatic defenses. It appears as a boss in the Revenge of Meta Knight stage of Kirby Super Star and its remake, Kirby Super Star Ultra, and as a Mid-Boss at the end of the Battleship Halberd level of Kirby's Epic Yarn and its remake, Kirby's Extra Epic Yarn. In each iteration, it's a large, stationary machine with one or more cannons attached, holding a gem (which is presumed to be its power source). It's unique in the fact the reactor itself cannot be damaged by Kirby, but only by the lasers it shoots to attack.

Game appearances[edit]

Kirby Super Star[edit]

The reactor as it appears in Kirby Super Star
So long as a reflected laser doesn't hit the reactor, it will be invincible.
— Sailor Waddle Dee, Revenge of Meta Knight - Chapter 6, Kirby Super Star Ultra
Eeeyah! Don't even say things like that!
— Captain Vul, Revenge of Meta Knight - Chapter 6, Kirby Super Star Ultra


The reactor is a large, round, brown-ish machine with a shining, color-changing gem as its power source. The machine stretches to the top of the screen and has a large, horizontal hole holding the gem with four spikes jutting upwards from the lower part of the machine and a decently large cannon pointing forwards. In the background, numerous Wheelies can be seen driving back and forth, seemingly used as batteries, with blue wires connecting the compartments together. The reactor is located on a grate-like floor and is positioned on the right side of the screen. It will not move apart from smaller compartments that it uses to attack; a small, nozzle-like compartment it uses to fire lasers, the cannon on the front of the machine and up to three boxes it uses to spout fire through the grate floor. After the boss is defeated, the wheelies escape, and the scene transitions to the stage where Kirby rides one of the Wheelies across the Halberd in order to escape the ensuing explosion. This boss also shows up in The Arena.


  • Laser: A small blue turret will appear from the top of the screen and angle itself to aim at Kirby. It shoots a single laser that must be redirected towards the gem to damage the reactor. The turret can be destroyed, but will reappear.
  • Cannon: The cannon at the front is almost always exposed. It attacks by charging up, then shooting two spiraling fireballs horizontally. If Kirby gets hit by these, he will get burned. This cannon can be permanently destroyed, but this is not required to defeat the boss.
  • Flame Pillars: The reactor sends forth up to 3 box-like machines underneath the floor. They will pause for a second before blasting pillars of fire upwards through the floor. These can be destroyed, but will reappear.

Kirby Super Star Ultra[edit]

Little was changed between the two versions, though this reactor has had a slight redesign. There are now 5 spikes on both the top and bottom compartment of the machine, all of which are adorned with small, blue balls. The gem now radiates in multiple colors as well. The box under the floor are more visible and the background shows more mechanisms between the Wheelie-batteries.

In Meta Knightmare Ultra, the core can also be damaged by Meta Knight's Mach Tornado. It additionally serves as the last boss of the Revenge of Meta Knight segment in this mode, which skips the last act of the sub-game in favor of progressing directly to Milky Way Wishes.

Kirby's Epic Yarn / Kirby's Extra Epic Yarn[edit]

KEY Battleship Halberd screenshot 3.jpg
The reactor as it appears in Kirby's Epic Yarn
Debut game Kirby's Epic Yarn (2010)
Latest game Kirby's Extra Epic Yarn (2019)
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At the end of the Battleship Halberd stage, Kirby uses his Star Shooter transformation to traverse a long hallway. At the end, the reactor core appears. It consists of two yellow main compartments: one at the top and one at the bottom of the hallway, each with three spikes with yellow balls on top, with a large green-colored gem in between them. Both compartments have one large cannon on it which shoots fire. Every once in a while, a UFO enemy will appear to impede Kirby's progress. The background shows grates, gears and panels. The goal is to destroy the two cannons, and then the gem. After this, the stage soon ends. In Kirby's Extra Epic Yarn, this Mid-Boss appears in Stage 4 of the Sub-Game Slash & Bead.


  • Fire: The main attack comes from the two cannons, each spouting a straight line of fire reaching all the way across the screen.
  • UFO: Every once in a while, a UFO enemy will appear from the top of the screen. It rapidly shoots three lasers, but can be destroyed.


  • The Kirby Super Star and Kirby Super Star Ultra versions of the Reactor is the only boss (to date) that can in no way be harmed by Kirby or his Helpers, but only by its own attacks.
  • In both versions of Revenge of Meta Knight, Sailor Waddle Dee specifies that a 'reflected' laser will damage the reactor core. However, in truth, the laser does not need to be reflected to do damage.


Names in other languages[edit]

Language Name Meaning
German Reaktor Reactor
Korean 리액터
Spanish Reactor -